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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
Confidence votes 2.6K. When you breathe in, air enters the body (via mouth or nose) and travels down a tube called the windpipe (aka trachea) and into the lungs. When you exhale, carbon dioxide gas is released. Heres something fun for you to try, take a deep breath (inhale with your nose) and try and imagine oxygen going into the lungs.